Eyesafe diffraction-limited single-frequency 1-ns pulsewidth Er:YAG laser transmitter
Eyesafe diffraction-limited single-frequency 1-ns pulsewidth Er:YAG laser transmitter
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DOI：
10.1117/12.716278
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发表时间：
2007-04
影响因子：
3.6
通讯作者：
R. Stoneman;R. Hartman;Eric A. Schneider;C. Garvin;S. Henderson
中科院分区：
文献类型：
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作者：
R. Stoneman;R. Hartman;Eric A. Schneider;C. Garvin;S. Henderson
报道了一种用于相干激光雷达的人眼安全的1617 nm单频Er：YAG激光发射器。发射机采用主振荡器/功率放大器架构，能够产生高峰功率输出。脉冲振荡器是Q开关和腔转储，导致在1.1 ns的脉冲宽度。脉冲振荡器是由一个商业1617 nm CW分布反馈激光二极管注入种子，导致在单纵模输出。振荡器和放大器是由商业二极管泵浦的连续1533 nm Yb，Er掺杂光纤激光器直接泵浦到Er：YAG激光器的上态。注入种子脉冲振荡器产生的平均输出功率为2.2 W，在10 kHz的脉冲重复频率（PRF）与脉冲宽度为1.1 ns（0.20 MW峰值功率）与光束质量的1.1倍的衍射极限。该振荡器在CW模式下的斜率效率为47%，从CW模式到注入种子脉冲模式的转换效率为85%。功率放大器在CW模式下产生20 W，光-光转换效率为34%，光束质量为衍射极限的1.1倍，在脉冲模式下产生6.5 W，脉冲频率为10 kHz，脉冲宽度为1.1 ns（峰值功率为0.59 MW）。
We report an eyesafe diffraction-limited single-frequency 1617 nm Er:YAG laser transmitter for coherent laser radar applications. The transmitter utilizes a master oscillator/power amplifier architecture, enabling the production of high peak power output. The pulsed oscillator is Q-switched and cavity-dumped, resulting in a 1.1 ns pulsewidth. The pulsed oscillator is injection-seeded by a commercial 1617 nm CW distributed feedback laser diode, resulting in single longitudinal mode output. The oscillator and amplifier are directly pumped into the Er:YAG laser upper state by commercial diode-pumped CW 1533 nm Yb,Er-doped fiber lasers. The injection-seeded pulsed oscillator produces an average output power of 2.2 W at 10 kHz pulse repetition frequency (PRF) with a pulsewidth of 1.1 ns (0.20 MW peak power) with a beam quality 1.1 times the diffraction limit. The oscillator has a slope efficiency of 47% in the CW mode, and a conversion efficiency of 85% from CW mode to injection-seeded pulsed mode. The power amplifier produces 20 W in the CW mode with an optical-to-optical conversion efficiency of 34% and a beam quality 1.1 times the diffraction limit, and 6.5 W in the pulsed mode at 10 kHz PRF with 1.1 ns pulsewidth (0.59 MW peak power).